Pipe-bending machine



0. P. KIRBY, JR PIPE BENDING MACHINE. APPLICATION FILED FEB. 21, 1908.

Pat nteei NW 3, 1908.

FNVIENTQR I WITNESSES RNEV U NliTED CHARLES F. KIRBY, JR, OF SAN FRANCISCO, OALIFOR-NTA.

PIPE-BENDENG llilliCHEhlE To all whom it may concern:

Be it known that I, QnAR Es F. Kmar 512, citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Pipe-Bending Machines, of which the following 18 a-speciiication.

My invention relates to a machine for bending tubing or pipe to any desired angle.

simple, cheap, practical device, particularly designed for use in gas, steam, water, and

other fittings, where it is necessary to bend tubing or pipe to form elbows or to make offsets.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a side elevation of the apparatus. Fig. 2 is an end view in partial section. Fig. 3 is a plan view-of the pipe-gripping device. Fig. 4 is a cross section of same.

A represents a base, bench, or any other suitable support for the apparatus. This support is here shown as slotted, with a fulcrum shaft 2 suitably ournaled on hangers 3 in the slot.

A forked lever 4 fulcrums on the shaft 2, and this lever carries the u pet and lower sheaves 56, with the lower s cave 6 fixed to the shaft 2 and lever 4, and turriable with the latter.

The adjacent portionsof the perimeters of the two sheaves are adapted to inclose or partially inclose a space for the reception of the pipe which is to be bent.

If desired, the upper sheave may be provided with suitable adjusting devices 7, of any well known character, for its shaft, whereby this upper sheave may be moved nearer to, or farther from, the lower sheave 6, in order to increase the range of utility of the device for pipe or tubing of different sizes.

The pipe to be bent is suitably gripped on the support A and held stationary against lengthwise or lateral movement by any appropriate means. In practice, I use a convenient form of gripping device, similar to that as here shown, in which Iemploy two eccentric gripping members 8 mounted on suitably spaced apart studs 9, and a to grip bar or latch 11, and an underneath mil ed or toothed grip er 12; this gri ping device be ing arrange in suitable a inement behind Specification of Letters Patent Application filed February 21, 1888.

The object of the invention is to provide a Patented Nov. 3, 1908.

Serial No. 417,155.

the sheaves. The latch bar 11 pivots on one of the shafts 9, and is ad j ustably held thereto by a nut 13. The opposite end of the bar has a notch 14- to reeeivethe opposite stud 9 beneath tail nut 15.

The operation. of the device is substantially centric grippers S are then closed, the

tail nut 15 screwed down. The forked lever 4; is then operated, causing the upper, roller 5 to bend the pine to the quired angle around the lower roller e; opers 8-1l.- 12 firmly holding the ainst being drawn forward during this bending operation.

If desired, the sheave 6 may be perforated at intervals to receives. steppin 16, which will abut against a stop plate 17 on the under side of the support h when the lever pulled down to its farthest limit, and indicate p, In

a 90 bend, or any other angle in which the pin may be set, and to which angle it is desired to bend the pipe. This pin will also strike against a front stop plate 18 when the lever is thrown upward, and prevent the lever falling back on the pipe support, and thus interfere with the ready removal and insertion of the pipe.

In order more eifectually to form offsets in the pipe, and which offsets may be at varying angles, I fix a graduated disk 19 on the fulcrum shaft 2; the graduations on this disk including, by words or figures, or any other suitable notation, different angles to which it may be desired to bend the pipe. 1 Thus, for an offset the pipe is fastened-in lace above, and the forked lever pulled own until the desired degree shows on the disk 19 above the base. The lever is then lifted, the pipe turned over, and the lever pulled down again to the desired degree, forming a second and opposite bend in the pipe; these reverse bends being known in the art as "oifsets.

For ordinary 90 bending, it is not necessary to refer to the disk, but more convenient, as a rule, to simply slip the pin 16 through the hole in the lower sheave and disk, and turn the lever until the pin 16 strikes the rear stop late 17.

Having thus descri ed my invention, what I claim and desire to secure by Letters Patent is- I 1. A pipe-bending machine consisting in combination with means for holding the pipe, s d means comprising spaced eccentime members havin a relative movement toward and from eac other, and a coijperat r. ing latch device, of a lever carrying two sheaves and operative, in the line of the pipe,

said sheaves adapted to have the pipe passed between them, with one sheave forming'the fulcrum, and the other acting on the oppolsite side of the pipe to bend the pipe a alnst the fulcrum when the lever is operate and means for adjusting the sheaves towards and from each other. I l

2. A pipe-bending machine consisting in combination with means for holding the pipe, of a lever carrying two sheaves and 0p erative in, the line of the pipe, said sheaves adapted to have the pipe assed between them, with one shea've forming the fulcrum,

and the other acting on the opposite side of the pipe to bend the pipe against the fulcrum when the lever is operated, and means for limiting the oscillating movement of the lever, said means comprising a stop pin removably fitting a hole in one of the sheaves and adapted to contact with a fixed part.

3. A pipe-bending machine consisting in' combination with means for holding the pipe, said means comprising coasting camwit having means for ending the .pipe on the oscillation of the lever.

which the pipe is to be bent, said means com' prising a graduated disk fixed to the shaft of one of the sheaves.

4. In a ipe-bending machine, the combination wit a suitable support, of pipe-gripping means, including I spaced eccentric members having a relative movement to- Wards and from each other, alatchlng device cooperating with said eccentricfmembers to gri the ipe, and a lever fulcrumed in line sai pipe-gri ping means, said lever In testimony whereof I have hereunto set my hand in presence of two subscribing wit- CHARLES F. KIRBY, JR. W tnesses: p CHARLES A. PENFIELD, S. H. NOURSE.- 

